User Guide

415
Linear Regress
ion
All variables must pass the tolerance criterion to be entered in the equation,
regardless of the entry method specified. The default tolerance level is 0.0001. Also,
avariablei
s not entered if it would cause the tolerance of another variable already in
the model to drop below the tolerance criterion.
All independent variables selected are added to a single regression model.
However, yo
u can specify different entry methods for different subsets of variables.
For example, you can enter one block of variables into the regression model using
stepwise selection and a second block using forward selection. To add a second block
of variabl
es to the regression model, click
Next.
Linear Regression Set Rule
Figure 26-3
Linear Regression Set Rule dialog box
Cases defined by the selection rule are included in the analysis. For example, if you
select a variable, choose equals, and type 5 for the value, then only cases for which
the selected variable has a value equal to 5 are included in the analysis. A string
value is also permitted.